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on is a mythological creature, typically depicted as a large and powerful serpent or other reptile, with magical or spiritual qualities.
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Energy wiki:

y is a measure of being able to do work. This is a fundamental concept pertaining to the ability for action. In physics, it is a quantity that every physical system possesses. This quantity is not absolute but relative to a state of the system known as its reference state or reference level. The energy of a physical system is defined as the amount of mechanical work that the system can produce if it changes its state to its reference state; for example if a liter of water cools down to 0Â°C or if a car hits a tree and decelerates from 120 km/h to 0 km/h.
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